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THE LIGHT 
TO LIVE WITH 


















































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-12 


Publication No. DP 


Copyright 1920 by Duplex Lighting Works 


TING WORKS 


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//,  BLECTRIC CO. 


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DUPLEA LIGH 


Refinement 





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6 WEST 48th. STREET 


NEW YORK CITY 


The Duplexalites described in this publication are manufactured and 


sold under Duplexalite Corporation patents 


WITHOUT 


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DUPLEXALI 





Examples of Good and Bad Lighting Using the 


Same Lamp and Shade 


Wiki wiels <4 Om LiGH TING? 





Good Lighting is Found on the Shady 
Side of a Tree on a Sunny Afternoon 


ET US substitute for the sun a MaAzpa C lamp, for the sky the 
ceiling of your room, and for the tree the Duplexalite. From the 
ceiling you now get a soft radiance which floods the entire room 

as completely as though it were open to the sky. From the diffusing 
disc of the Duplexalite, you get a generous addition of light directly 
beneath, which has all the directional quality of sunlight filtered through 
foliage. At the same time, the Duplexalite is protecting your eyes from 
the brilliancy of the MAzDA C lamp as comfortably as the tree offers 


protection from the glare of the sun. 


You can no more dispense with the ceiling reflection than you can 
the sky. Nor would the unshaded brightness of the MAzpa C lamp 


offer any more advantage to see by than the desert sun at noon. 


By means of Duplexalite, the MAzpA C lamp has been equipped 
in a way to produce the most charming lighting effect that occurs 


in nature. 


Good lighting is the proper distribution of light 


Three 


EE Wiel Aas Ge eae lel 


The MaAzpA C Lamp is the 
Sun of Artificial Lighting 


E all know what happened to the man who took a 

long look into the face of the noon-day sun before 
smoked glasses were invented. Of course it was unneces- 
sary. It is equally unnecessary to gaze directly at the 
filament of the Mazpa C lamp. 


The immense amount of research and development 
work which finally made possible the commercial manu- 
facture of the Mazpa C lamp, had two important results: 

First, the Mazpa C lamp surpasses all others in efficiency, 
both when new and throughout the useful life of each lamp. 


Second, the discoveries made in the process of perfecting 
the Mazpa C lamp indicate that any lamps of higher 
efficiency which may be developed in the future, will have 
the same typical feature, namely, a very compact filament 
of high brilliancy. 
After much study and experiment, devices have been 
designed to control this wonderful brightness and distrib- 
ute it wisely for the benefit of eyes and nerves, to our 


great comfort and efficiency. To use such devices 1s not only desirable, but necessary. 





When this is done the Mazpa C lamp provides the best lighting obtainable and at 
the least expense. 


The highest efficiency lamps that are made in small sizes are the Mazpa B lamps. The following diagram illus- 
trates the economy of using a Mazpa C lamp instead of several smaller lamps 


pothy 
Bopeeaes 


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150: WATT MAZDA C LAMP USES 150 WATTS AND GIVES 2049 LUMENS (UNITS OF LIGHT) 





Four 


Waele Ch DIE’ ole El TIN.G 


‘The Duplexalite Shades the MAzpa C 
Lamp and Diffuses its Brightness 


UPLEX Lighting is the natural method of controlling the light from a Mazpa C 
lamp. The lighting unit designed for obtaining the advantages of Duplex 
Lighting from the Mazpa C lamp is called the Duplexalite. 


Duplex Lighting is the natural method of light distribution because it combines a 
day-like diffusion with direct lighting where most needed. 


c 


In every other method of illumination, the element of direct lighting is either 
lacking or is radiated at unnatural angles at which the eye has no protection. ‘The 
result is an irritation of the retina, combined with an involuntary contraction of the 


iris, producing the sensation commonly complained of as “glare.” 


In a Duplexalite, more than 96% of the light given off is deflected in useful directions; 
that is, wpward for ceiling reflection and downward for additional intensities — Duplex 
Lighting. Less than 4% of the light is given off at angles which produce glare, as 
compared with the usual 30% to 45% with other systems in which any appreciable 
amount of direct lighting is provided. 


The illustration on page 9 shows how the exterior of the metal deflector of the 
Duplexalite is self-illuminated. 


The diagram below indicates the principles of Duplex Lighting and 
the typical design of the Duplexalite 






































































































































DiupilLEx 


Don LIGHTING 




















Five 


seas 


The Standard Duplexalite 





SIAN BYARD. IBAGR ELIE. C0 Ba ba Ba sins 


HE Standard Duplexalite is the basis of all forms of Duplexalites, and is essential 

for Duplex Lighting. It consists of the necessary ceiling plate or canopy adapted 
to all standard ceiling outlets, a suspension made‘of specially constructed silk-covered 
electric cable with “Acorn” strain-relief grip at top and bottom, an electric lamp socket 
enclosed in a substantial cover of simple design, a characteristic metal deflector and 
moulded glass disc supported by flat metal hooks which lock these parts in the correctly 
focused position for the rated size of Mazpa C lamp. ‘The deflector, socket-cover and 
canopy are finished in the most durable matt-surfaced porcelain enamel of a deep ivory 
color, the interior reflecting surface being of white enamel. 














é Diameter of 
Number Wattage of Lamp Socket Length Over All Pencece 
D-131 100-150 Medium 36” ipa 
D-231 200 Medium 48” 14” 
D-531 300-500 | Mogul 60” | 16” 


The Duplexalite is adapted to any requirement where good lighting is sought. In the home it can 
be used in every room — kitchen, dining room, living room, library, nursery, bedrooms, bathrooms, etc, 
Below is a picture of the kitchen of the Good Housekeeping Institute. The Du- 
plexalite was tested by their department of Household Engineering and was award- 
ed the official approval of the Institute, Serial Number 2009. 








Good Housekeeping Institute Kitchen 


Seven 


DEGORATIVE POSS 1B ESTs Geisseig 
CER TREX 1 Cee ENE 


The Unseen Duplexalite Enhances a Beautiful 
Shade and Produces a Beautiful Lighting Effect 


HE characteristic distribution of light from the Duplexalite opens up an entirely 
new field of decorative possibilities. Heretofore the use of decorative shades has 
been limited by the necessity for producing an acceptable lighting result by means of 
the fabrics employed. For this reason, it has always been necessary to provide such 
shades with a white lining and to avoid the use of many colors otherwise desirable, 


because of their effect upon the light transmitted. 


The self-illumination of the Duplexalite is sufficient to attractively illuminate any 
form of decorative shade without interfering in any way with the upward and downward 
lighting. ‘The significance of this lies in the fact that Duplexalite shades are illuminated 
for the purpose of beautifying them, instead of being over-lighted for the purpose of 
general illumination. ‘This permits of the use of almost any translucent fabric which 


may happen to meet a decorative requirement or suit an individual taste. 


The photographs reproduced below illustrate the notable fact that the illumination 


produced with a Duplexalite is unchanged by the addition of the shade. 


re 
* 





Examples of Duplex Lighting with and without a shade 


RelAIN GE @ Vike VLE MWe @ Eas PaVi eT ROE 
IBAUN ie sae IIe, 





N this illustration a Duplexalite shade (of silk) and the Duplexalite deflector (of 
metal) are shown as transparent in order to illustrate clearly the mechanical con- 


struction of this effective lighting device. 


From this illustration it will be undertsood 
that all light from the brilliant filament of the 
Mazpa C lamp is utilized in the following way: 


1 — From the top of the wide-mouthed deflector a large portion 
of the rays go directly from the lamp to the ceiling. 


2 — All rays intercepted by the metal deflector, which is white 
enameled inside, are deflected either upward to the ceiling 
or downward through the diffusing disc. 


3 — The rest of the light rays go directly from the lamp to the 
translucent glass diffusing disc, through which the direct 
light is filtered to an agreeable softness. 


4— A small amount of the light is reflected upward from the 
outer edge of the diffusing disc so that it illuminates the 
outside of the metal deflector. It is this self-illuminating 
feature which makes the Duplexalite so perfect a “servant 
of light’”— useful but not conspicuous — and which pro- 
vides the soft beautifying illumination of the Duplexalite 
shade. 





In addition to the lighting advantages, please 
note also the following practical conveniences: 


1— The Duplexalite shades may be removed by tilting and 
taking off sideways. They may be put away for the 
summer with the curtains, changed from warm colored 
silks in winter to bright figured cretonnes in summer, or 
changed from room to room in a few moments for special 
occasions. 


2— Raising the metal deflector straight up a few inches 
unlocks the diffusing disc which may be washed as easily 
as a lunch plate, and may be locked into place again by 
merely raising and lowering the deflector. 


3 — The deflector is finished in porcelain enamel and is easily 
kept clean by occasional dusting. 


4 — Duplexalite construction affords the most perfect venti- 
lation, thus insuring the longest life and efficiency of the 
Mazpa C lamp. 


Nine 


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ON STANDARD DUPLEXALITE 





EMEP IERIE 1 BAB DRAB IS eu Ea ia la eis 


HE Empire Shade is historic. In its dignified simplicity, it embodies the typical 

construction of all Duplexalite shades, consisting of an upper ring with projecting 
supports which rest on the deflector, and a substantial frame over which the shade is 
formed. Its conventional lines conform to the best standards of taste for a wide 
variety of uses. Empire Shades are made of silk gathered on the frame with silk 
lining and gimp trimmings. 


The Empire shade may 
be ornamented without 
changing the appearance of P ie 
dignity and simplicity. j 









Are 


Empire shades are made i 
in old rose, old gold, ecru 
or blue. 





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Reception Hall of a New York Residence which is lighted throughout with Duplexalite 


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IMG URE IO! INGE IE Teele IDMONEIGI sp. Gad Gy ba lake: 


HESE decorative Empire shades are made of colored silks covered with figured 
net and trimmed with gold or colored braids to harmonize with the colored pattern. 
The delicate traceries are thrown into just the right relief on a Duplexalite. The patterns 


are consequently very effective, whether seen lighted or by daylight. 


Figured Net Shades are made in the following colors: 
Coror “A” — Blue and gold figured net over gold silk lining, trimmed with gold braid. 


Cotor “B” — Net with ecru woven ground. Flowers in blue and mulberry. Gray silk lining. Trimmed 
with blue braid. 


Cortor “C” — Net with ecru woven ground. Flowers in old rose and blue. Old rose silk lining. Trimmed 


with old rose braid. 

TasseEt “‘D’’—which is shown, covers the ivory socket cover and matches the old gold 
silk of the pendant. It is made of heavy silk fringe and can be put on 
afanyetimesditer the | uplexaliteiis installed® [tis *put.on and taken 
off as easily and quickly as the Duplexalite shades.. 





Note how the Figured Net Shade Harmonizes with the 
Hangings in this Living Room 


Thirteen 


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ShadesNo. sores LasselDeand Disc-ocreen eas 
ON STANDARD DUPLEXALITE 


Fourteen 





DINING ROOM DUPLEXALITES 


INING Room Duplexalites are fitted with shades having the silk closely pleated 

and finished in ruching form at top and bottom. ‘The silk lining is in every case 

of a warm colored tint. The Disc Screen is made of light silk trimmed with old gold 
braid, and covers the glass diffusing disc. 


Shade No. 5025 has double box pleated 
tuching at top and bottom and a heavy 
silk fringe. 


Dining Room Shades are made in ecru, 
old gold, old rose, delft blue, French gray 
or deep red. © Disc. Screens are made sin 
old gold, old rose or ecru. 








The table lighting filters through a gold colored silken disc cover while the furniture 
in the background is enriched by the general illumination. 


Fifteen 


Painted Parchment Shade No. 5012 and Tassel ‘‘D” 
ON STANDARD DUPLEXALITE 


Sixteen 





ANON EIO! Ive CimiWWeiNe IBIGI CI G.u baa ahs 


MONG tthe most useful and durable materials for making Duplexalite shades is 

Japanese Parchment. Parchment Shades are made in the Empire form and 

bound with antique gold galloon. Painted Parchment Duplexalites are among the 
most finished productions obtainable in decorative shades. 


L 


Shade 5059 


Natural parchment, 
stripe top and bot- 
tom. (Blue unless 
otherwise specified.) 





Plain Parchment Shades 
have an antique finish and 
are bound with antique gold 
galloon. 





Shade No. 5051 
Hand painted. Birds 
of Paradise and fol- 
iage on an antique 
background. 





DU PEEXAELLES 


Silk tassel for socket cover 
is not included, andthe effect 
obtained is one of extreme 
simplicity and high quality. 


Shade No. sor1 


Plain parchment, antique finish . 





Painted Parchment Duplexalites in a Bachelor's Drawing Room 


Seventeen 


ShadésNomsors and lasse: DD 
ON STANDARD DUPLEXALITE 


Eighteen 





IRGUNKE: JONGGE Ede Dp. Gaulig id Bens 


HE most natural form of Duplexalite Shade is that made of suitable materials 
suspended from a supporting ring. Somewhat less formal than Empire Duplexa- 
lites, the Ring Duplexalites offer an opportunity for a more intimate style of decoration. 


Figured Silk Ring Shades, as illustrated on the opposite page, are finished with antique 
gold braid and ornamental antique gold fringe. Mulberry, blue or gold ground. Shade 
No. 5019, below, is of draped China silk in solid colors; old rose, old gold, ecru or blue. 
Silk braid edging at top and uncut silk fringe at bottom, weighted. 


Shade 5019 Shade 5018 









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SSA 
gi. Oe 





Shade 5022 


Cretonne Shades are favored for Bedrooms; also for general summer use. No. 
5018 is an attractive nursery pattern. No. 5022 is furnished with either reds or yel- 
low predominating, as ordered. 





AtlypicalsiotelyGuesty Room 


Nineteen 


Twenty 


SHADE. NO. 5005 | WALDORF-ASTORIA 





DUPLEXALITES WITH SPECIAL SHADES 


Shade No. 5005 The Duplexalite Hanger 
is of draped silk, lined. Trimmed shown has a rigid stem wound with rich silk cord. It is fur- 
with antique gold lace and bullion nished with a special tassel of silk and bullion fringe, and a 
fringe. Made in colors as ordered. special ceiling canopy Hnished in gold or silver, as ordered. 





PPE eo aie Sea Wels eee ite LA Paes TLE AT ES 


Shade No. 5o004-A Shade No. 5024 Shade No. 5004-B 
Black Japanese figures on ecru Octagonal shade, shirred silk with Oriental pattern, on a dark back- 
ground. fringe and antique gold braid. ground. 


Made in colors as ordered. 


Twenty-on? 


iW i | Ty = : 


SHADE NO. 5026 SHADE NO.S-5002 





DUPGRX ADULT ES . Wal rl Bs iC eAo wes Lice lubes 


Shade No. 5052 Shade No. 5040 Shade No. 5035 
Antique gold lace over silk. Bullion and Gold metal lace over shirred silk. Draped chiffon over Galloon braid and 
silk fringe.* Gold braid and flowers.* flowers.* 
Shade No. 5026 Shade No. 5002 
Heavy, old gold silk fringe. Gold *Made in colors as ordered. Stretched silk, gold and silk 
braid. braid.* 


Twenty-two 








pl eee ele a Ce Nee DP OE XAT eer 


Dull glazed porcelain enamel in shaded golden brown with decoration fused into the surface in 
darker tone. The Etruscan Duplexalite is designed to meet those requirements where a neat, though rich, 
ornamental fixture is appropriate and where no shade is desired. 


Twenty-Three 





Duplexalite Diffusing Disc. 





Disc Screen “B” 


Disc Screen “A” 





Tassel “D” 


HE DIAGRAM below shows the proper hanging length to obtain most uniform light distribu- 
tion. The shadow line (A) should meet the junction of ceiling and walls. For home lighting, 
evenness of illumination is not always necessary and the length may be increased, if desirable; although 
in most cases the hanging length, as sketched, will provide the most satisfactory appearance as well as 
the best lighting. The length is easily adjusted to suit the requirements when the Duplexalite is being 


installed. 


Hanging Length 





No. D-29 ‘‘Pullite’? Canopy Switch should be specified where there is no wall switch. 


Standard and Etruscan Duplexalites are shipped complete in substantial cartons, as follows: 











Number Size of Carton Weight 
D-131 1234” x 1234" x 454" 51% lbs. 
D-231 1434" x 1434" x 5” 614 lbs. 
D-531 1634” x 1634" x 534” 814 lbs. 








Duplexalite Shades and Accessories are shipped in individual cartons. 


Twenty-four 


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